Improved machine for grinding cutlery



UNITED STATES PATENT OFFICEO RUSSELL S. GLADWIN, OF MERIDEN,CONNECTICUT.

IMPROVED MACHINE FOR GRINDING CUTLERY, 80C.

Specification forming part of Letters Patent No. 56,403, dated July 17,1866.

To all whom it may concern:

Be it known that I, RUssELL S. GLADWIN, of Meriden, in the county of NewHaven and State of Connecticut, have invented a new and usefulImprovement in Machines for Grinding Cutlery, Tools, Ste.; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawings, making apart of this specification, in which- Figure 1 represents an elevationof the machine. Fig. 2 represents a top plan, and Fig. 3 represents asectional elevation thereof at the line x a: of Fig. 2.

Similar letters of reference, where they occur in the separate figures,denote like parts in all the drawings.

My invention consists in giving to the facewheel which holds and carriesaround the knife or other blanks to be ground a tipping motion as eachblank comes under the grindstone, so as to grind it tapering in twodirections-viz., in the line of its length and transversely thereto.

To enable others skilled in the art to make and use my invention, Iwillproceed to describe the same with reference to the drawings.

On or in a suitable frame, A, there is hung a face-wheel, B, that isgrooved or shouldered radially or nearly so, as seen at a a, 85e., intowhich grooves or against which shoulders the backs of the knife-blanks bare placed and supported while under the stone C.

The face-wheel is supported in a cross-piece, D, which can be raised orlowered by the gears c d cf, so as to bring said face-wheel and thearticles to be ground properly up to the grindstone C, which is hungupon the shaft E and rotated in any of the usual ways. The grindstone C,as represented, is quite narrow on its face. In practice the Width ofthe stone should equal the length of the knifeblanks--say six inches,more or less.

The table B is revolved slowly by means of a worm-gear, g, on the shaftF, and the cogged gear h and worm or screw gear i on the shaft G, whichlatter worm or screw gear z' works into the rim i of the table B, andthus turns it.

Upon the cross-piece or cross-head D, and underneath the grinding-pointof the stone, there is a friction or bearing roller, m, and upon theunder side of the rim of the face-plate or table B, and opposite eachgroove, shoulder, or recess a upon its top surface, there is a slightcam, n, (distorted as to size in the drawings, so as to be more readilyseen,) which cams, as they come in contact with the friction or bearingroller m, raise up the table and bring each knife-blankin succession upagainst the stone, and so that it will be ground tapering as to lengthof blade and beveled as to width of blade, or in the shape ofthefinished knife.

Each recess a is made with a shoulder at one of its edges, from whenceit is beveled or run out to the surface of the table.

The back of the knife-blank lies against the shoulder of the recess,while the balance of it is on the inclined plane extending from saidshoulder to the surface of the table. These shoulders are reversed onsome of the recesses, so that the blank can be turned over, while thetang will always be at the center of the table.

In practice the table turns very slowly and the stone very rapidly, andthe stone, whenof proper width, begins to grind first at the heel oftheblade, and gradually, as the table turns, approaches the point oftheblade, which point, by means of the rising of the table, as abovedescribed, brings the blade harder up against the grindstone and removesmore from it.

The journal upon which the table turns may be hollow and the center ofthe table dished out, so that the water and drippin gs from the stonemay pass off through said shaft or journal.

A burr, H, controlled by a rod, I, may be drawn to or forced from thestone C, and held in either position by the dog and ratch o. Itspurpose, when drawn against the stone, is to roll against its surfacefor the purpose of keeping it sharp or taking off the glaze.

' Having thus fully described my invention, what I claim is Incombination with a revolving grindstone.

and a roller or its equivalent placed opposite its grinding -point, aninterposed table with suitable recesses for holding the knife or otherblank to be ground, and series of cams under said table and operating inconnection with the stone and the roller, substantially in the mannerand for the purpose set forth.

UUSSELL S. GLADWIN.

Witnesses ESTHER Gnrees, OnvILLE H. PLATT.

